feat(kol): expand variable schema and polish KOL UI

- Add length/range limits to KOL variable definitions: max_length and
  default_value for input/textarea, min_value/max_value/default_number
  for number. Backend validates and normalizes; frontend renders limit
  inputs in KolVariableConfig and applies limits at runtime in
  KolDynamicForm.
- Sort workspace cards by most recent prompt/package update, falling
  back to granted_at. Adds updated_at to KolWorkspaceCard.
- Polish TemplatesView, WorkspaceView, and KOL package management UI;
  route create/update/publish/archive/delete toasts through i18n and
  expand package form copy and status labels.
- Remove stale KnowledgeView.vue.patch.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

server/internal/tenant/app/kol_variable_renderer_test.go

@@ -69,6 +69,39 @@ func TestKolVariableRenderPrompt(t *testing.T) {
 			values:  map[string]any{},
 			wantErr: "missing variables",
 		},
+		{
+			name:    "uses default text value when missing",
+			content: "Hello {{city}}",
+			schema: KolSchemaJSON{
+				Variables: []KolVariableDefinition{
+					{ID: "var_city", Key: "city", Label: "城市", Type: KolVariableTypeInput, Required: true, DefaultValue: stringPtr("合肥")},
+				},
+			},
+			values: map[string]any{},
+			want:   "Hello 合肥",
+		},
+		{
+			name:    "rejects text exceeding max length",
+			content: "Topic: {{topic}}",
+			schema: KolSchemaJSON{
+				Variables: []KolVariableDefinition{
+					{ID: "var_topic", Key: "topic", Label: "主题", Type: KolVariableTypeInput, Required: true, MaxLength: intPtr(4)},
+				},
+			},
+			values:  map[string]any{"topic": "超过四个字"},
+			wantErr: "exceeds max length",
+		},
+		{
+			name:    "rejects number outside configured range",
+			content: "Top {{count}} results",
+			schema: KolSchemaJSON{
+				Variables: []KolVariableDefinition{
+					{ID: "var_count", Key: "count", Label: "数量", Type: KolVariableTypeNumber, Required: true, MinValue: float64Ptr(1), MaxValue: float64Ptr(5)},
+				},
+			},
+			values:  map[string]any{"count": 6},
+			wantErr: "must be between 1 and 5",
+		},
 	}
 
 	for _, tc := range testCases {
@@ -136,3 +169,46 @@ func TestKolVariableValidateSchemaRejectsDuplicateKey(t *testing.T) {
 	require.Error(t, err)
 	require.Contains(t, err.Error(), "duplicate variable key")
 }
+
+func TestKolVariableValidateSchemaRejectsLongDefaultValue(t *testing.T) {
+	t.Parallel()
+
+	err := ValidateSchema(KolSchemaJSON{
+		Variables: []KolVariableDefinition{
+			{ID: "var_topic", Key: "topic", Label: "主题", Type: KolVariableTypeInput, MaxLength: intPtr(2), DefaultValue: stringPtr("过长默认值")},
+		},
+	})
+
+	require.Error(t, err)
+	require.Contains(t, err.Error(), "default value exceeds max length")
+}
+
+func TestKolVariableValidateSchemaRejectsInvalidNumberRange(t *testing.T) {
+	t.Parallel()
+
+	err := ValidateSchema(KolSchemaJSON{
+		Variables: []KolVariableDefinition{
+			{ID: "var_count", Key: "count", Label: "数量", Type: KolVariableTypeNumber, MinValue: float64Ptr(10), MaxValue: float64Ptr(5)},
+		},
+	})
+
+	require.Error(t, err)
+	require.Contains(t, err.Error(), "max value must be greater than or equal to min value")
+}
+
+func TestKolVariableValidateSchemaRejectsDefaultNumberOutOfRange(t *testing.T) {
+	t.Parallel()
+
+	err := ValidateSchema(KolSchemaJSON{
+		Variables: []KolVariableDefinition{
+			{ID: "var_count", Key: "count", Label: "数量", Type: KolVariableTypeNumber, MinValue: float64Ptr(1), MaxValue: float64Ptr(5), DefaultNumber: float64Ptr(6)},
+		},
+	})
+
+	require.Error(t, err)
+	require.Contains(t, err.Error(), "default number must be between 1 and 5")
+}
+
+func stringPtr(value string) *string {
+	return &value
+}